ci: add new go versions to CI

Signed-off-by: Mark Sagi-Kazar <mark.sagikazar@gmail.com>

Author: sagikazarmark

.github/workflows/ci.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: ['1.11', '1.12', '1.13', '1.14', '1.15']
+        go: ['1.11', '1.12', '1.13', '1.14', '1.15', '1.16', '1.17', '1.18']
     env:
       GOFLAGS: -mod=readonly
       GOPROXY: https://proxy.golang.org